Ore-roasting furnace.



Patented Feb. 22,1916.

WITNESSES: I IN|{ENTOR I ORNEY W-. H. HDTTER.

ORE ROA'STING FURNACE.

APPLICATION FILED MAY 19, 1913.

WILLIA n..-Mo'r'mn, or nnnvnafeonomo, assienon 'ro' 1mm? a; no'rrm To all whom it may concern:

onn-noe's'rme nunnacn.

Be it known that I, WILLIAM dent of the ,city and county of Denver, State of Colorado, have invented certain new and useful Improvements in Ore-Roasting Furnaces; and'I do declare the. following to be a full, clear, and exact description of my invention, such as Wlll enable others skilled in the art to which it appertains to make and use the same,'reference being had to the accompanymg drawings,

and to the figures of reference marked thereon, which form a part of this specification.

Myinvention relates to improvements in ore roasting furnaces and has for its object the provision of a machineof this character which will produce a uniform and eflicient oxidation of the ore.

Other objects of my invention reside in the particular arrangement of elements and combination of parts which will be hereinafter fully explained by reference to -the accompanying drawings.

In these drawings Figure 1 1s a side elevation view of my improved ore roasting furnace; Fig. 2 is. a longitudinal section through the front end. of the machine; Fig.

composed of a plurality of sections 6, 7, and

8. Sections'6 and 7 of the cylinder'are composed of two walls 9 and 10, the said walls being separated from each other and forming an air space or flue space through which the products of combustion pass.

- The inner wall 10 of the sections is connected with the outer wall 9 by means of arms 12. Inother wordsthe se arms' 12 connect with a ring '13, which is provided with laterally extending flanges 14, upon which the outer wall is supported. The circum ference of this. ring 13 extends beyond the outer wall of the cylinder as shown at 14. Each extremity of each section 6 and 7 is constructed in this manner, whereby when the sections are put together in alinement Specification of LettersPatent. ama... med-x5 19, 1913. Serial in. 708,559,

' a citizen of the-United States, anda resi-v Pate teu Feb. 22, 1916.

the rings-13 abutfltogether and bolts 15 are passed there-throu' h, for securin the said sect ons together; he outer wal s9. of the sections rest upon the shoulders or flanges 14, the sa d flanges or shoulders 'servin to support the said outer wall in position. he outer wall of each of the sections 6 and. 7 is composed -'of sheet metal '16, lined with asbestos The sheet metal parts 16 of each sectlon are composed of two longitudinal halves 18 and 19,- which overlap at their edges 20 and are secured together by means of bolts 21,'passing through angle members 22. By tightening these bolts 21, 1

thetwo halves 18 and 19, composing the sec-' tions may be tightly drawn together and 'made'to firmly and rigidly clasp or engage with'the flanges or shoulders 14. Theparts 140i the rings13, which extend beyond the outer wall of the cylinder, form tracks whlch engage rollers 23, 24 and 25. The rollers, 23 and 24 are mounted upon. a shaft 26, the said shaft being journaled in supports 26. The extremities of the'cylinder are respectively journaled in housings 28 and 29, the housing 28 composing a part of [the flue, while the housing 29 forms the firex; Thefire-box is designated by the reference character'30,-whi le the flue is designated by the reference character 31. .The outer wall 9 of the cylinder stops with the flue 31, .while the inner wall 10 of said cylinder continues on through the flue 31 as shown at 32. The interior of the inner wall 10 of the cylinder is provided with spiral flanges 33, which flanges extend entirely through the cylinder.

A tubular'member 34 is partially inserted into the forward end of the cylinder through an opening 35. Within the tubular member 34 I journal ajfeed screw 36. The axis of this feed screw36 extends beyond or exteriorly of the tube '34 and is journaled in a boxing 37. A sprocket-wheel 38 is mounted.

.upon the axis-of this feed screw 36 and a sprocket chain 39 is 'assed around said sprocket wheel 38an arounda similar sprocket wheel 40 mounted-upon shaft 26.

transferred from the shaft 26 to thefeed screw 36, whereby the latter will be operated for feeding the ore or other material to be roasted into the roasting cylinder. A feed hopper 41 is arranged in communication with the interior of the tube 34, and through .Thus by this arrangement" power will be this feed hopper 41 the ore or material passes into the tube 34, where it is taken up by the feed screws 36 andcarried into the cylinder.

A gear wheel 42 is mounted upon the cylinder, the said gear wheel 42 entirely surrounding said cylinder and meshing with a pinion 43. A shaft 44 is journaled in journal boxes 45, said shaft 44 being provided with a gear 46, which meshes with a gear 46' adapted to transmit power to the pinion 43. Also mounted upon this shaft 44 is a cone pulley 47, adapted to accommodate the motor belt. Power is transmitted to the gear wheel 42,to cause the cylinder to revolve, through the medium of this cone pulley 47,

shaft 44 and pinion 43. Thus the cylinder is caused to revolve and engagement of the latter with the rollers 23 and 24 causes the shaft 26 to revolve, which transmitspower to the feed screw 36 for operating the latter. During the revolving of the cylinder the ore is deposited in the latter by the feed screw 36 and the spiral flanges 33 cause the ore to gradually and uniformly travel through the cylinder. These flanges 33 serve to uniformly distribute the ore, whereby the latter is thoroughly exposed to the influence of the heat.

By referring to Fig. 1 of the drawings it will be seen that the inner wall 10 of the cylinder terminates at a certain distance from the rear end, however, the outer wall 9 of the cylinder being continued. This continuation of the outer wall 9 of the cylinder forms the section that has been designated 8 in Fig. 1 of the drawing. The wall composing this portion of the cylinder or section 8 of the latter is lined with fire-clay material 48, having flanges of spiral shape 49 arranged therein. It is necessary to line this section 8 with fire-clay, since this section is the closest to the furnace and is subjected to very intense heat which would result in injury to this portion of the cylinder were it not for the fact that the latter is lined with the fire-clay. The ore or material is fed by the spirals 49 of this section into a chute 50, through which chute the ore or material is deposited upon a conveyer 51, by means of which the said ore or material is carried to any suitable place of deposit.

An air pipe 52 passes through section 8 of the cylinder, said air pipes forming a spider and supporting a centrally located bell 53. This bell 53, of course. c0mmuni cates with the interior of these air pipes 52, the said bell 53 being arranged directly in front of the extremity of the roasting member of the cylinder, whereby the air from the air pipes 52 is directed into the inner wall or roasting member of the cylinder, while the .shape of the bell serves to prevent the products of combustion'from passing through the inner wall or roasting member of the cylinder, but on the contrary said bell dlrects the smoke and product of combustion through the space between the two walls of the cylinder. The outer extremities of the air pipes 52 are provided with caps 54, which caps are adjustable to control or regulate the amount of air admitted into said pipe. In other words these caps 54 are slidably mounted in the outer extremities of the pipes 52, the said caps being provided with openings or slots 55 through which the air passes. These pipes 52 are held in place within section 8 of the cylinder by means of nuts 56, inserted upon the outer extremities of said pipes in engagement with washers 57. By virtue of these air pipes 52 arranged within section 8 of the cylinder, the air in passing through said pipes will be heated before the air comes into contact with the ore or materialwithin the furnace. Thus the air will have no negative influence upon' the roasting ore within the cylinder. The air from the pipes 52 passes through the bell 53 into the roasting member of the cylinder, passing through the latter and into a dust chamber 58, through the opening 35. From this dust chamber 58, the air passes through a downwardly inclined pipe 59 into a baflied chamber 60. The air circulates through the chambers of this bafi'led chamber as indicated by the arrows, and then through a pipe 61 into a water tank 62. The air in passing through the cylinder, the dust chamber 58, pipe 59, and baflled chamber 60, allows the dust carried thereby to settle in said dust chambers the volatile matter being carried through said chambers and forced into the water of the tank 62, by means of afan 63, which is arranged in the pipe 61. A section 63 of the pipe 61 passes into the water tank 62 and extends into the water of the latter. This section 64 of the pipe'61 is composed of clay or other material which will not be effected by the acid. This section 64 is supported by means of a flange 65, resting on top of the water tank. By inclining the pipe 59 downwardly, any dust which may settle in said pipe will pass into the baflied chamber 60 under the influence of gravity.

A plate 66 is bolted to a flange 67 formed on the forward end of the part 32 of the cylinder. This plate 66 is provided with a thimble 68, which forms the opening 35 heretofore referred to. This thimble 68 is received in a similar thimble 69 formed upon the dust chamber 58. The section 32 of the cylinder is of greater diameter than the opening 35, whereby a flange or rim 70 is formed at the rear end of the section 32, which prevents the ore or material deposited in said section 32 by the feed screw 36, from passing rearwardly through the opening 68.

The space'between the two walls 9 and 10 of the cylinder, as heretofore explained, forms a flue space for the smoke and products of combustion to pass through from the firebox 30. By reason of the fact that the outer wall 9 is lined with asbestos, the outer cold air is prevented from afieoting the temperature in the flue space. In other words the heat from the fire-box is retained within this flue space and its influence imparted to the ore within the roasting member of the cylinder.

The fan 63 serves to create asuction which results in drawing the air through the roasting member of the cylinder from the bell 53. Thus volatile matter is carried through this cylinder with the air, some of said dust and volatile matter settling in the dust chamber 58, while another portion of it passes through the baflied chamber 60 and any remaining dust or volatile matter is forced under water in the tank 62 where the remaining valves are precipitated. I provide doors 71 in the baffled chamber 60 through which the dust may be removed from said chamber.v By reason of the fact that the roasting member of the cylinder. passes through the chamber 31, forming a portion of the flue space, the dust and volatile matter is prevented from escaping through the flue.

While I have illustrated and described herein a specific form of my invention it is understood that I am not limited thereto and that the same may be varied and modified without departing from the-spirit of my invention or the scope of the appended claims.

Having thus described my invention what I claim and desireto secure by Letters Patent is i l. A furnace, comprising a cylinder composed of an inner' member and an outer member supported around the inner mem her and leaving a space between said members, the outer member having a part extending beyond the inner. member, a transverse pipe passing through said part and communicating with the'exterior of the latter, a bell-member arranged in front of the inner memberand supported by said pipe, said bell-member being in communication with said pipe, and. a fire-box with which said part is in communication.

2. A furnace of the class described, comprising a cylinder composed of an inner member and an outer member supported around the inner member and leaving a space between said members, the outer member having a part extending beyond the inner member, transverse pipes arranged in said part and communicating with the exterior of the latter, means controlling the outer extremities of said pipes for regulating the admittance of air therein, a member supported by said pipes on the interiorof said part and arranged in front of the inner member, said member directing the air verse pipes arranged in said partv and com-.

into the inner member of said cylinder, a fire-box with which said part is in communication, and said bell directing the products of combustion into the space between the two members of said cylinder.

3. A furnace, comprising a cylinder composed of an inner member and an outer member supported around the inner mem ber and leaving a space between said members, the outer member having a part extending beyond the inner member, a fire-box with which said part is in communication, said part being lined with fire clay having flanges formed thereon, a transverse pipe passing through said part and communicating with the exterior of the latter, adjustable caps controlling the outer extremities of the said pipe, and a member in communication with said pipe on the interior of said part, said member being arranged to 'discharge into the inner member of said cylinder, and to deflect the product of combustion into the space between the two members of said cylinder.

4. A furnace, comprising a cylinder composed of an inner member and an outer member, supported around the inner member and leaving a space between said members, the outer member having a part extending beyond theinner member, pipes passing through said part and communicating with the exterior of the latter, the said pipes having a member in communication therewith on the interior of said part, the: said pipes being adapted to admit oxygen into the inner member of the cylinder for creating a suitable roast of the ore such as is required for subsequent treatment of the latter, and a fire-box with which said pipe is in communication.

5. A furnace, comprising a cylinder composed of an inner member and an outer' member, supported around the inner memher and leaving a space between said members, the outer member having a part extending beyond the inner member, a firebox with which sa-id part is in communication, transverse pipes passing through said part and communicating with the exterior of the latter, and a bell-member arranged on the interior of said pipe and in communication with said pipe. 1

6. A furnace, comprising a cylinder composed of an inner member and an outer member, supported around the inner member and leaving a space between said members, the outer member having a part extending beyond the inner member, transmunicating withthe exterior of the,latter, adjustable caps controlling the outer extremities of the said pipes for regulating the admittance of oxygen according to the character of roast desired, said pipe being in communication on the interior. of said 180 part with the inner member of the cylinder,

and a source of heat with which said part is in communication.

7 An ore roaster, comprising a cylinder formin a roasting member and a flue member, Sfild' cylinder being formed with a plurality of sections, each of said sections having a flange on its extremity, other flanges carried by said first named flanges extending at right angles to the latter and supporting the flue member around said roasting member, bolts passing through said first named flanges for securing said sections together, said first named flan es being so located as to provide spaces etween the roasting member and the flue member, and rollers upon which said cylinder is revolubly mounted, said rollers being engaged by said flanges of the sections composing said cylinder.

8. An ore roasting furnace, comprising a cylinder composed of a roasting member and an outer flue member, both of said members being composed of a plurality of sections, the extremities of the sections of the roasting member having rings supported thereon and there being a space between said rings and said sections, laterally arranged flanges on said rings, the sections of the flue member being engaged by said flanges and supported around the roasting member by the same, the space between the two members forming a flue space, and a fire box with which said flue space is in communication.

In testimony whereof I aflix my signature in the presence of two witnesses.

WILLIAM H. MOTTER. Witnesses:

J NO. G. POWELL, GERTRUDE M. GARDNER. 

